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I have a 69 big block barracuda with an 8 3/4 rear end, I was wondering what sure grip center unit casting number this car should have. Thanks, Wolfe

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Are you asking about the center section casting numbers or the posi unititself ? 1969 was the year that Mopar changed both, you could have a 721,742 or a 489 third member housing and you could have, depending on exactly when the car was assembled, either the Dana clutch type posi or the later GM style cup and cone type units